Pen



FIG. 1 is a perspective view of an embodiment of a pen showing my new design;

FIG. 2 is a front elevational view of the pen of FIG. 1;

FIG. 3 is a rear elevational view of the pen of FIG. 1;

FIG. 4 is a left-side elevational view of the pen of FIG. 1;

FIG. 5 is a right-side elevational view of the pen of FIG. 1;

FIG. 6 is a top plan view of the pen of FIG. 1; and,

FIG. 7 is a bottom plan view of the pen of FIG. 1.

The broken lines in FIGS. 1 to 7 are included to show portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 